Fan



Aug. 3l, 1943.

E. E. HANS FAN Filed June 18, 1941 2 Sheets-Sheet l Aug. 31, 1943. E, E HANS 2,328,072

FAN

Filed June 18, 1941 2 Sheets-Sheet 2 Patented Aug. 31, 1943 UNITED STATES PATENT OFFICE FAN Edmund E. Hans, Detroit, Mich, Application June 18, 1941, Serial No. 398,512

z claims. (ci. 23o-1z0) This invention relates to improvements in fans. The invention aims, among other things, to provide a fan primarily intended for use in automobile heaters and air conditioning systems, which can be driven by quite a` small motor, say an electric motor drawing about fifty watts, and which will deliver a relatively large volume of air. say about four hundred feet, at a relatively high pressure, say about one-half to one inch of water.

Another object of the invention is to provide a fan having a relatively large number of transversely inclined blades which overlap one another throughout their entire radial length, and which are mounted in an orifice of only very slightly larger diameter than the distance between the peripheries of radially opposed pairs of blades. so that the blades rotate partly in the orifice and partly within a casing of larger cross section than the orifice extending from the discharge side of the latter.

A further object of the invention is to provide such a fan wherein an inwardly projecting an-' nular flange is provided around the inlet side of the oriiice to prevent backiiow of air through the latter.

Yet another object of the invention is to provide a fan wherein the hub consists of two discs superimposed one upon the other each having an equal number of transversely inclined blades projecting therefrom, and the trailing edges of the blades projecting from the upper disc slotted adjacent the latter to coact with corresponding slots formed in the leading edges of the blades projecting from the lower disc so that the trailing edges of the blades on the upper disc may extend beneath and overlap the leading edges of the blades on the lower disc,

Another object of the invention is to provide such a fan which is relatively cheap and simple to manufacture and highly eiiicient in operation.

Having thus briefly stated some of the objects and advantages of the invention I will now describe one embodiment thereof with the aid of the accompanying drawings, in which:

Figure 1 illustrates a side View thereof, and the casing in section, and

Figure 2 is an inverted plan view.

Figure 3 is a plan View of the upper plate and the blades thereon.

Figure 4 is a somewhat enlarged sectional view of the bushing and the plates mounted thereon.

Figure 5 is a sectional view on the line 55 of Figure 3 showing a cross section of one blade on the upper plate, and

Figure 6 shows a similar cross section on the lower plate.

Referring to the drawings, I designates a supporting member having a circular orifice 2 formed therethrough around the inlet side of which an annular inwardly projecting flange 3 ls provided. The supporting member I is mounted in a suitable casing la of larger cross section than the orifice 2, and formed integral with the said member is a spider 4 terminating in a split ring 5 in which a motor 6 is supported concentrically with the said oriiice. The split ring l is secured around the motor 6 by a screw 1 by which the adjacent extremities of the split ring are drawn together. Suitably secured around the shaft 8 of the motor 6 is a bushing 8.

I0 and lila denote two plates superimposed one upon the other. Each plate I0 and I0a has a centrally apertured disc II and ila from which uniformly spaced and transversely inclined radial blades I2 and I2a extend. The two discs II and IIa, which together form a hub, are secured upon the bushing 8 and held immovable thereon as by riveting over the outer circumfer ence of the latter at one extremity as shown at 9a.

Formed in the trailing edges of the blades I2 adjacent the disc II are slots I4. and formed in the leading edges of the blades I2a adjacent the disc IIa are corresponding slots Ila. The` two plates I0 and Iva are relatively so mounted upon the bushing 9 that each blade I2 on the upper plate I0 is equidistant between two adjacent blades I 2a outhe lower plate Ilia, and the width of allv the blades is such that each projects circularly beyond the adjacent margins of the blade on each side of it. The provision oi' the cooperating slots Il and Ila perm-its the overlapping of the downturned trailing edges of the upper blades I2 so that they may extend beneath the leading edges of the blades I2a on the lower plate Ilia.

'I'he formation of the blades is clearly shown in Figures 5 and 6 from which it will be seen that the trailing edges I2' of the blades I2 on the upper disc I I project farther downward from the latter than the trailing edges I2a below the disc IIa, and the leading edges I2" of the said blades I2 on the upper disc II do not project so far upward as the leading edges I2a" of the blades I2a on the lower disc Ila. Consequently when the two plates I0 and I 0a are mounted in position the leading edges of'all the blades I2 and I2a, and also all their trailing edges, are in augment.

Due to the fact that the opening through the annular ange 3 is less than the distance between the peripheries of opposed pairs of blades I2 and |2a, and the bore of the orice 2 is only 'very slightly greater than the aforesaid dispressure through a somewhat restricted area such as the casing la.

As the size of the blades on both plates I0 and I0a is the same both plates may be blanked out, including the formation of the slots i4 and Ma, by the same dies. Tol form the blades in the 'upper plates I0 the blanks are placed in the forming die with theirl slots trailing, and to form the blades for the lower plates Illa the blanks are placed in the same forming die with their slots leading (by turning the plates over). Moreover when forming the upper plates I0 a spacing piece must be inserted in the diie beneath the disc portion Il to raise the latter so 'that the variation referred to in the upward and downward projections of the blades ils produced. Thus the same blanklng and forming dies may be employed to manufacture both the upper and the lower plates.

I claim:

1. In a fan, thecomblnation of two plates each having a central disc and a plurality of blades provided with radially extending edges, said blades having decreasing `transverse pitch and increasing width toward their outer ends, and having the outer margins thereof concentric to the axis of the discs, said discs being superimposed one upon another so that the radial edges of the blades are slightly overlapped, and the combined peripheries of the blades form a cylinder, a ring surrounding the periphery of the blades and having an inturned flange thereon forming a corner between the ring and flange, said fan being mounted in said ring so that the blade ends occupy said corner.

2. A fan comprising a support, a ring having an oriilce therein carried by the support, a fan element having blades mounted in said ring with t the blades lying partially within said orifice and `and the combined peripheries of the blades form a cylinder, an inturned flange on said ring forming a corner at the junction of the ring and flange, said fan blades occupying said corner.

EDMUND E. HANS. 

